Objective To evaluate the uncertainty of determination of sodium chloride in squid shreds by direct precipitation titering method. Methods The uncertainty caused by various factors in the whole process of determination was analyzed, including weighing, solution preparation, solution delivery, standard titration solution concentration and titration process, etc. Results The uncertainty of the method was mainly caused by the uncertainty of concentration of titrating solution and repetitive error, especially the uncertainty of concentration of titrating solution derived from weighing process. The expanded uncertainty was 0.043%. The content of sodium chloride in squid shreds was (2.49±0.043)%(P=95%, k=2). Conclusion The established method can provide basis for evaluation of the reliability of the measurement method and results of sodium chloride in food.
标题：直接沉淀滴定法检测鱿鱼丝中氯化钠的 不确定度评定
英文标题：Uncertainty evaluation for determination of sodium chloride in squid shreds by direct precipitation titering method
